Ventilation – Having both inlet and outlet airways – Including automatic control means
Patent
1996-07-05
1998-07-14
Joyce, Harold
Ventilation
Having both inlet and outlet airways
Including automatic control means
169 54, 169 56, 454253, 454342, B24F 1100
Patent
active
057795371
DESCRIPTION:
BRIEF SUMMARY
This invention relates to a deposit cupboard for keeping solvents, combustible liquids and the like, comprising shelves and at least one openable/closable, possibly lockable door as well as assigned an air inlet and exhaust device, and wherein the cupboard is assigned a fire extinguishing apparatus having an automatic, preferably thermostat-controlled release means.
In the most advanced deposit cupboards and cabinets for keeping solvents and the like, presently available on the market, the exhaust device is positioned at the top of the cupboard, more specifically laterally in the top plate of the cupboard, a built-in channel extending down to the bottom of the cupboard at the same side. The deposit cupboard is equipped with two usual round exhaust valves, one above and one below. These exhaust valves are substantially made in plastics. The air inlet is through the doors and through circumferential leakages. An explosion-proof fan provides the ventilation through a channel extending from the top of the cupboard, laterally thereof, and upwards above roof. The system is adapted to be permanently in operation, and comprises only an on-off switch, but has no automatic control device.
Through the positioning of the two exhaust valves, one above and one below, an optimally controllable exhaust air flow could not be achieved. Thus, caused through lacking control of the exhaust air, one could not prevent the formation of gas accumulations, especially within the middle zone of the cupboard, but also in other zones not reached by the air, and wherein, thus, no flowing has been effected.
Upon current break, cold/fresh air will ooze down through the channel system from the fresh air side, through the fan and into the cupboard through the two plastics valves. Thereby, gas accumulations in the cupboard are brought to ooze outwards through leakages in the cupboard, and this may cause unfortunate or damaging pollution of the environment around the solvent deposit cupboard. Gases from solvents are inflammable and may cause fire and explosion damages in addition to direct solvent damages on personnel staying in the neigbourhood of the cupboard in such a situation.
This known deposit cupboard for solvents and the like lacks in addition to a controllable exhaust means also devices for fire alarm, for fire extinguishing and for picking up sparks. Nor has the known cupboard a device for securing the personnel in case of an explosion in the cupboard.
Indeed, from DE patent specification No. 33 31 331 a deposit cupboard for i.a. solvents has been known, wherein the cupboard is assigned a fire extinguishing apparatus, but this cupboard also lacks a controllable exhaust device, a fire alarm device and a device for picking up sparks; nor does it have a device for securing the personnel in case of an explosion in the cupboard.
Therefore, the object of the present invention has been to eliminate or at least reduce these defects, disadvantages and limitations of use of prior art technique and, thus, provide a deposit cupboard for solvents and the like, wherein the formation of undesirable gas accumulations within the middle zones of the cupboard hardly may be formed, and wherein fire alarm and fire extinguishing devices are present within the cupboard, and wherein a safety device is adapted to come automatically into function as the result of a sudden pressure increase within the cupboard, caused by an explosion in the interior thereof.
Substantially, this object is realized through a combination of features, wherein the shelves of the cupboard are perforated and/or placed at a distance from at least one of the adjacent inner faces of the side walls (preferably all four) of the cupboard, and wherein the top plate of the cupboard is pivotally supported and adapted to--upon extremely high pressure conditions (explosion) within the cupboard--to be limited swung up to a securing or protecting position, in which it forms a shield, protecting the personnel.
The deposit cupboard for solvents and the like has, according to the invention, air in
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patent: 4243773 (1981-01-01), Arnaud et al.
patent: 4625627 (1986-12-01), Livanos et al.
patent: 4928583 (1990-05-01), Taylor et al.
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